Only run git-status inside a work tree

utils/shgit

@@ -13,8 +13,11 @@ shgit()
 {
 	: ${SHGIT_BEGIN:=} ${SHGIT_END:= } ${SHGIT_SEP:=:}
 
-	gitdir=$(git rev-parse --git-dir 2>/dev/null) && [ -n "$gitdir" ] ||
+	args=$(git rev-parse --git-dir --is-inside-work-tree 2>/dev/null) ||
 	    return
+	set -- $args
+	gitdir=${1:-}
+	worktree=${2:-}
 
 	if ! name=$(git symbolic-ref -q --short HEAD); then
 		name=$(git rev-parse --short HEAD 2>/dev/null)
@@ -34,7 +37,13 @@ shgit()
 	fi
 
 	status=
-	[ -n "$(git status --porcelain)" ] && status=${SHGIT_SEP}*
+	if [ "$worktree" = "true" ]; then
+		if [ -n "$(git status --porcelain)" ]; then
+			status=${SHGIT_SEP}*
+		fi
+	else
+		status=${SHGIT_SEP}?
+	fi
 
 	IFS="	" set -- $(git rev-list --left-right --count \
 	    @{upstream}...HEAD 2>/dev/null)